5 Belle Detector (2005) 7 sub-detectors for precise Vertexing, Tracking, Particle ID,Calorimetry
6 Upgrade plan (near future) ECL・Waveform sampling・Pure CsI crystal for endcap・Optimization of the clustering code・Faster front end electronics・Faster trigger signal・Optimization of the tracking codeCDCSVD・Shorter strip/pixel for the inner layers・Faster readout electronics・Optimization of the vertex codeKLM・Scintillator tile with SiPMreadoutDAQ upgradeTDC based readout pipelined system Dead time free up to 5kHz trigger rateComputing system upgradeCPU, mass storage and network system
7 SVD Upgrade schedule Direction SUPERBELLE Layer 1 replacement is scheduled in 2007 summerSVD3 schedule depends on approval of the project.2005200620072008200920102011Luminosity (1034)2.03.05.025SVD2.0ReinforcementSVD2.0→SVD2.5Replace L1 laddersSVD2.5→SVD3Full upgradeR&DTestProd.R&DTestInstallationProd.SVD Upgrade schedule
8 Simulation Study for Higher Beam Background Detail was reported in the last WS by K.Senyo.MC +BGx1MC+BGx20
9 Hawai 05 WorkshopInteresting proposal by the Vienna group (M.Pernicka) to reduce background induced occupancy in Vertex detector reduction with the possibilities of APV25 andBackground reduction using the multi-peak modeOne possibility would be to measure the time between trigger and the hits. Thus off-time hits can be discarded. Hits in the selected trigger window are event candidates.The APV25 has the possibility to store 3 consecutive samples (spaced by the system clock) of a signal (multi-peak mode) with one trigger. With a second trigger just 3 clocks later, you can get the next 3 time samples of the shaped input signal. We can use this possibility to determine the time between shaped detector signal and clock.Background reduction using the multi-peak modeMost hits from background events are not correlated (in time) with the trigger (continuous beam). At the moment we have a time window to accept data of >2400 ns for the VA1TA and ~150ns (50ns peaking time) for the APV25. This window of 150ns should be reduced again.Additional reduction of the time window (and thus of the background) by a factor around 8-10!Summary by M. Giorgi
10 KEKB Collider Upgrade Scenario world records !~1010 B mesons/year !!& also t+t-Lpeak = 1.561034cm-2s-1Ltot = 431fb-1 (May.14, 2005)Major upgrade ofKEKB & Belle(>1yr shutdown)SuperKEKBcrabcavitiesLpeak (cm-2s-1)Lint1.5x1034431 fb-1~5x1034~1 ab-1~5x1035~10 ab-1
11 Severe (financial) problems when it is compared with
12 Scenarios in the next decade We are hereMuch interesting workhas already been done on this topic.Can we find a more effective way to get the message across?LHC turns onLHC finds SUSYLHC doesn’t find SUSYHEPWhat can aSuper B Factory say aboutSUSY-breaking models?What can the ILC say aboutSUSY-breaking models?
13 Pessimistic (?) Conclusions of Hitlin (BaBar Spokesman) What is needed to make the case A credible integrated luminosity capability approaching 10 ab-1/yearAn accelerator with an upgrade path, as with the current B FactoriesA detector that is conservatively designed and able to cope with background surprises and future luminosity upgradesA credible plan for gathering a data sample of 10’s of ab-1 that allows the marquee important measurements to be made on a time scale that is competitive with LHCb and relevant to clarifying SUSY discoveriesAn algorithm that there demonstrates the power of a real-time dialog between the LHC, a Super B Factory and, eventually, the ILC, would be a killer appWe have made real progress on this – more is neededDiscussions on forming a truly international collaboration on an appropriately scaled accelerator and detectorThis would, for example, facilitate an ICFA endorsementThis could provide a critical mass of people and funding potential to convince the community that a Super B Factory should go forward
14 ee J/ψ X, all currently available data (Exp7-41) Neue Resultate – X(3940)ee J/ψ X, all currently available data (Exp7-41)X(3940)η‘cηcχc0
15 B KX(3872), X ππJ/ψ, data from Exp7-39 Neue Resultate – X(3872)B KX(3872), X ππJ/ψ, data from Exp7-39ψ(2s)X(3872)
16 JPC possibilities for X(3872) DD allowed & P-violating unlikelysignal for X γJ/ψ C=-1 ruled outcheck of angular distributions rules out 1±-,0±+,2--fits of Mππ 2-+ unlikelyX(3872) = χc1‘? unlikely, since mass and BR ratio way off theo. expect.
17 HEPHY Physik-Analysen Heinz Dibon: Parallelanalyse semileptonische D° Zerfälle Franz Mandl: Studie der inklusive Zerfälle D° K*X / fX Gerald Richter: Dekohärenz Modelle verschränkter B-Paare Christoph Schwanda: Matrixelemente der HQET Laurenz Widhalm: Formfaktoren semileptonischer D° Zerfälle
18 Heinz DibonParallelanalyse semileptonischer D°-Zerfälle Zweck: Cross-Check der Analysemethode von LW, Quantifizierung von deren Effizienzvorteil Rekonstruktion des Neutrinos gelingt bereits (siehe plot), derzeit wird an der Optimierung der cuts gearbeitetNeutrino Auflösung |ptrue| - |prec| in GeV
19 e+e- Inclusive Decays D0 K*0X and D0 0X Franz Mandl Some time ago ( Fig)reported:B (D0 K*X) B (K* K-+) 6.67% B (D0 K*X) 10%Method: Full reconstruction of events:tag side+ 0, 1, 2primarymesonse+e “right sign”signal sidepreliminary studies on efficiences etc have been reported (also for D0 0X)all particles “left over” in reconstruction should come from D0 (signal side)ideal method for the determination of inclusive branching ratios forD0 hX, h = K*0, 0, , , …… (not yet known)
20 OLD Franz Mandl “some time ago” not in PDG list“some time ago”K-+ effective masses of combinations of charged particles from kinematically selected D0 via recoil, tagging D*+D*-, D*+D*-0 and D*+D*-+- , …. eventsB(D0 K*X) * B(K* K-+) = * 3.8% = 6.67%OLD
21 Franz Mandl M (K) line: e+e- D*+D*- MC (2 pr) red crosses: e+e- D*+D*- (0, + -) data (2, 3, 4 pr)arbitrary normalizationok for 3, 4 prD0 K*0 X (signal)D0 h1X h2XD0 KXM (K)at least one particle misidentified
23 QM coherence model investigations Gerald RichterQM coherence model investigationspreliminary studies:ML-fit sensitivity for assumed Model and errorsStatus:preliminary studies finished, fit method delivers sufficient sensitivity
24 QM coherence model investigations Gerald RichterQM coherence model investigationsdefining cuts on MC-data to achieve sufficient time resolutionsresolutionsso farStatus:improving primary vertex resolution
28 Method of „full inclusive reconstruction“ Laurenz WidhalmMethod of „full inclusive reconstruction“additional primarymesons3.5 GeVe+e-8 GeVpKrecoilD*D*recoilppmass- / vertex fitD„inverse“ fitDrecoile/µpnKppp
29 Overview Background Composition Laurenz WidhalmOverview Background Composition++D° penDATAD° pmnDATAright sign*right sign*mn² / GeV²mn² / GeV²wrong sign*wrong sign*neutrino invariant mass squared, all cuts applied except neutrino mass cutsignalhadronic bkg, misidentified pionsnon-D° bkgbkg from D° Klnhadronic bkg, misidentified kaonsbkg from D° K*ln, D° r*ln
30 q² distribution – comparison of models pole mass – comp. with CLEO & FOCUSISGW2 modellattice calc.pole modelD0 plnAnalyse derzeit in der Refereeing Stage / Präsentation auf Sommer Konferenzen in Vorbereitung
31 Ereignisrekonstruktion in C++ bei BELLE Ereignisrekonstruktion in C++ bei BELLE PDA Seminar 11/ Laurenz Widhalm
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